Could Cirrus Clouds Have Warmed Early Mars?

@article{Ramirez2017CouldCC,
  title={Could Cirrus Clouds Have Warmed Early Mars?},
  author={R. Ramirez and J. Kasting},
  journal={Icarus},
  year={2017},
  volume={281},
  pages={
          248-261
        }
}
The presence of the ancient valley networks on Mars indicates that the climate at 3.8 Ga was warm enough to allow substantial liquid water to flow on the martian surface for extended periods of time. However, the mechanism for producing this warming continues to be debated. One hypothesis is that Mars could have been kept warm by global cirrus cloud decks in a CO2-H2O atmosphere containing at least 0.25 bar of CO2 (Urata and Toon, 2013). Initial warming from some other process, e.g., impacts… Expand
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